I have a left handed one that I built into a .50 cal long rifle. I can get upwards of 50 shots out of a good flint without knaping it. At one of the rendezvous one of the guys came up with a target where one of the rules was that the sights had to be on the bottom, in other words the rifle had to be up side down. It went off without a hitch. There were a half a dozen other flints on the shooting line and some of them took five or six attempts before they fired. By the way, I missed, but it wasn't the rifle's fault.